fs/exec.c:de_thread: mt-exec should update ->real_start_time

924b42d5 ("Use boot based time for process start time and boot time in
/proc") updated copy_process/do_task_stat but forgot about de_thread().
This breaks "ps axOT" if a sub-thread execs.

Note: I think that task->start_time should die.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Acked-by: John Stultz <[email protected]>
Cc: Tomas Janousek <[email protected]>
Cc: Tomas Smetana <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/fs/exec.c b/fs/exec.c
index 396aec2dae90472ae302f7a05d5ae2b14598643f..9c73def87642fc8f36624b7fa525504541a59a04 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -932,6 +932,7 @@ static int de_thread(struct task_struct *tsk)
                 * also take its birthdate (always earlier than our own).
                 */
                tsk->start_time = leader->start_time;
+               tsk->real_start_time = leader->real_start_time;
 
                BUG_ON(!same_thread_group(leader, tsk));
                BUG_ON(has_group_leader_pid(tsk));